Richard Neal, an employee of Aviva used to carry out the cyber attack on the company as revenge after falling out with colleagues.
He created a fake identity within his former company's system and used it to reject expenses claims from his erstwhile colleagues.
He also hacked into Esselar's Twitter account and replaced its logo with a bleeding heart - a calling card meant to make it clear that its security had been compromised.
The attack caused Essela to lose around £528,000 deal with Aviva.
Source: https://www.bbc.com/news/technology-34052408
"id": "AVI223823422",
"linkid": "aviva-plc",
"type": "Cyber Attack",
"date": "05/2014",
"severity": "90",
"impact": "5",
"explanation": "Attack threatening the organization's existence"